GSD-2021-33503
Vulnerability from gsd - Updated: 2023-12-13 01:23Details
An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.
Aliases
Aliases
{
"GSD": {
"alias": "CVE-2021-33503",
"description": "An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.",
"id": "GSD-2021-33503",
"references": [
"https://www.suse.com/security/cve/CVE-2021-33503.html",
"https://access.redhat.com/errata/RHSA-2021:4702",
"https://access.redhat.com/errata/RHSA-2021:4162",
"https://access.redhat.com/errata/RHSA-2021:4160",
"https://access.redhat.com/errata/RHSA-2021:3473",
"https://access.redhat.com/errata/RHSA-2021:3254",
"https://advisories.mageia.org/CVE-2021-33503.html",
"https://security.archlinux.org/CVE-2021-33503",
"https://linux.oracle.com/cve/CVE-2021-33503.html",
"https://ubuntu.com/security/CVE-2021-33503"
]
},
"gsd": {
"metadata": {
"exploitCode": "unknown",
"remediation": "unknown",
"reportConfidence": "confirmed",
"type": "vulnerability"
},
"osvSchema": {
"aliases": [
"CVE-2021-33503"
],
"details": "An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.",
"id": "GSD-2021-33503",
"modified": "2023-12-13T01:23:18.123679Z",
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}
},
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{
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},
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{
"affected_range": "\u003c1.25.4||\u003e=1.26.0,\u003c1.26.5",
"affected_versions": "All versions before 1.25.4, all versions starting from 1.26.0 before 1.26.5",
"cvss_v2": "AV:N/AC:L/Au:N/C:N/I:N/A:P",
"cvss_v3": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"cwe_ids": [
"CWE-1035",
"CWE-400",
"CWE-937"
],
"date": "2023-08-24",
"description": "An issue was discovered in urllib3, when provided with a URL containing many `@` characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.",
"fixed_versions": [
"1.25.4",
"1.26.5"
],
"identifier": "CVE-2021-33503",
"identifiers": [
"CVE-2021-33503",
"GHSA-q2q7-5pp4-w6pg"
],
"not_impacted": "All versions starting from 1.25.4 before 1.26.0, all versions starting from 1.26.5",
"package_slug": "pypi/urllib3",
"pubdate": "2021-06-29",
"solution": "Upgrade to versions 1.25.4, 1.26.5 or above.",
"title": "Uncontrolled Resource Consumption",
"urls": [
"https://nvd.nist.gov/vuln/detail/CVE-2021-33503"
],
"uuid": "e911aff3-e47b-41b4-a4fd-3e91a0cae9a3"
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"impact": {
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"authentication": "NONE",
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"version": "2.0"
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"obtainAllPrivilege": false,
"obtainOtherPrivilege": false,
"obtainUserPrivilege": false,
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},
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"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"exploitabilityScore": 3.9,
"impactScore": 3.6
}
},
"lastModifiedDate": "2023-08-24T13:42Z",
"publishedDate": "2021-06-29T11:15Z"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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